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TLS Online TPP Program

#Question id: 1533

Why might using retroviral vectors for gene therapy increase the patient's risk of developing cancer?

#Unit 4. Cell Communication and Cell Signaling

  1. Retroviral vectors may introduce proteins from the virus.

  2. Retroviral vectors do not express the genes that were introduced into a patient's cells.

  3. Retroviral vectors do not integrate their recombinant DNA into the patient's genome.

  4. Retroviral vectors integrate recombinant DNA into the genome in ways that may misregulate the expression of genes at or near the site of integration.

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TLS Online TPP Program

#Question id: 10823

#Unit 10. Ecological Principles

Which of the following statements about symbiotic relationships is true?
TLS Online TPP Program

#Question id: 10824

#Unit 10. Ecological Principles

Interspecific competition has been demonstrated experimentally in
TLS Online TPP Program

#Question id: 12640

#Unit 10. Ecological Principles

Plant species produce a which type of  defensive proteins that bind to carbohydrates or carbohydrate-containing proteins. After being ingested by an herbivore, that bind to the epithelial cells lining the digestive tract and interfere with nutrient absorption
TLS Online TPP Program

#Question id: 12257

#Unit 10. Ecological Principles

Which of the following is most likely to reduce competition in sympatric, closely related species? 
TLS Online TPP Program

#Question id: 12256

#Unit 10. Ecological Principles

Ant species X preys upon ant species Y. A researcher has the following set of observations regarding the behaviour of species X where aggression signifies a predatory response.

Which of the following statement(s) are correct regarding the behaviour of Species X?

(i)    A glass bead is sufficient to elicit the predatory response.

(ii)   Both chemical and non-chemical cues are involved in the predatory response.

(iii)  Chemical cues are necessary to elicit the predatory response.

(iv) Chemical cues are sufficient to elicit the predatory response
TLS Online TPP Program

#Question id: 12255

#Unit 10. Ecological Principles

The following three panels show the change in population size over time for two species when they are found alone and when they are found together. Which kind of interaction best describes the relationship between the two species?